Like Pabrai and Spiers, this year's winner (or winners) will be able to invite up to seven companions for a private lunch with the world's richest man at New York's Smith & Wollensky Steakhouse. They can ask Buffett anything at all, except what he's buying or selling.

A spokesperson for San Francisco's Glide Foundation, the beneficiary of the auction, just told me (about 10:15p Friday evening) that they're totally confident the bid is legitimate, although the winner has not yet been officially verified.

Bidders had to be pre-qualified, to reduce the chances of sham offers.

The high bidder is known by the eBay user name of 'greenteabug.' The user name had been newly created yesterday, and has no 'feedback' reviews.

In a live interview with CNBC this week before sitting down with last year's winners, Buffett called Glide a "marvelous, marvelous" organization run by a "remarkable man" named Cecil Williams who brings hope to "people the world has given up on."

Current Berkshire price:

See Warren Buffett Watch on CNBC's The Call, most weekday mornings at 11:50a ET